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Dw12 Crankshaft


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37 replies to this topic

#21
B1ack_Mi16

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Ah you're in Slovenia :) 

 

Say hello to him from me and tell him we should do some more vodka drinking at a Gatebil festival again sometime, it was great fun last time.



#22
drmo

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Ah you're in Slovenia :)

 

Say hello to him from me and tell him we should do some more vodka drinking at a Gatebil festival again sometime, it was great fun last time.

Finally noticed :D Yes, it was great fun :)



#23
Putte205

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As I have this crank too, I've researched this a while ago.

how about:
Xu10j4 block
96mm crank
Re-bushed 152mm xu10j4 rod to 22mm
Wiseco 4g63 87mm postons with 35mm comp height, available with dish -4,5 -10 -14 -17 -22.

-10 dish would give about 11:1 comp ratio? And piston flush with deck? -14 dish about the same as standard 10,4:1?

Might have miscalculated though. Kristian?

#24
Putte205

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Oh, instead of re-bushing xu10j4 rods, any xu10j2 rod with 22 pin should fit, I just dont have any laying around as I do xu10j4 parts

#25
B1ack_Mi16

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Arent the XU10J2 rods press fit?

 

Ideally I like to use a 158mm rod and not a 152mm one due to the rod/stroke ratio.

But of course it is probably possible.



#26
B1ack_Mi16

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I agree, the -10cc dish woul give 10.7:1 compression, quite nice.



#27
welshpug

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depends how wild you go on the cams, ok for standard ones, not much else though!



#28
B1ack_Mi16

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Of course, I'm fed up with wild cams :)



#29
welshpug

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naaah, they're fine, if it all works together properly, and its mapped well.



#30
Putte205

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Not sure about xu10j2 rods, you might be right. Re-bushing xu10j4 rods will work fine for me, if possible I'd like to use as many standard parts as possible for a start and I can probably re-bush at my work.

Kristian, what cc do you use to calculate for head and gasket? 40cc head and 7,? for gasket?

Of course I have to check piston to valve clearance, and if needed it can always be adjusted.

#31
dcc

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Rod angle might be issue with such long stroke and long rods.

The ew12 block is shorter than the xu10 iron block, not sure what sort of rod and crank room youll have in an xu. Also not sure about the oil pump drive on dw crank in xu.

I am tempted to use the dw12 crank instead of the ew12 I have, but not expecting to rev my engine beyond 7500 due to rod length and having 96mm crank.

My engine will be around 13-1 cr, using either non vvt gti 138head or the 2.2 head :) meirions standard XU10J4RS head performs faultlessly on his 2.2.

The only concern id have using this crank in xu is half the bearing shells are matched to the block on an ew, it makes it very hard to just build the engine - you need a standard set of bearings, plastigauge and some patience while measuring. The ew using colours for tolerances. I am not sure how this will differ to the xu block with it not being a crank ladder.

#32
welshpug

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Specifically that is the case in an xu block as well.

#33
B1ack_Mi16

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Well regarding bearings etc. I suppose it's no worse than using XUD11 bearings on the DW12 crank, can't really see that as a problem at all. Just measure the crank journals to be within tolerance and order appropriate bearings.

 

But the block to rod clearance might of course be a problem, that is hard to address until it is tested.

 

The oil drive I think looked just the same as any other of my XU cranks, basicly I couldn't see any difference between the DW and XU ones. Apart from the Alu block cranks that have different thrust bearing width.

 

Maybe I'll just go for K20 (K568M875) pistons and machine down a bit. A reworked unschrouded cylinderhead to 44cc will give 11:1 exactly.

I was using head volume of 41cc in my calcs, is 40cc definately an orginal Mi16 head?
 

For HG I use 88mm bore 1.3mm thick = 7.9cc



#34
Putte205

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I cant see any big issues either. Journals are the same size so bearings cant be that hard to find suitable ones, and everything else can be machined to fit. But that we will find out when test mounting in the block.

Im unsure about cc, thats the info i found on here. Im going to use 2.0 mi16 head, but ill try to get it measured to be sure about comp ratio. I've seen someone on aussifrogs measure 40cc from gti6 head, when others say its only 36..

I'm not even sure I'm going N/A yet, could be fun upgrading my 2.0 T16 in my 205 for a 2.3 T16 if i find suitable pistons/rods

#35
Putte205

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How much is usally custom pistons? I'm tempted to go overboost. Looks like Nissan 300zx wiseco pistons would give me about 8,5:1 comp ratio with standard head, and 2 spare pistons... however pistons would be 3mm down the bore, so no better design than original T16

#36
dcc

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Why notjust buy proper pistons to your design?

#37
Putte205

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I am considering to do so, hence my first question. If custom ones aren't that much more I might as well.

#38
xy8

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Rod angle might be issue with such long stroke and long rods.

The ew12 block is shorter than the xu10 iron block, not sure what sort of rod and crank room youll have in an xu. Also not sure about the oil pump drive on dw crank in xu.

I am tempted to use the dw12 crank instead of the ew12 I have, but not expecting to rev my engine beyond 7500 due to rod length and having 96mm crank.

My engine will be around 13-1 cr, using either non vvt gti 138head or the 2.2 head :) meirions standard XU10J4RS head performs faultlessly on his 2.2.

The only concern id have using this crank in xu is half the bearing shells are matched to the block on an ew, it makes it very hard to just build the engine - you need a standard set of bearings, plastigauge and some patience while measuring. The ew using colours for tolerances. I am not sure how this will differ to the xu block with it not being a crank ladder.

  No problems with oil pump drive .    Rod to block clearance is tight in places (under 2 mm)  , I used xu10j2 block and rods with dw12 crank. 


Edited by xy8, 13 June 2017 - 03:02 PM.